Teachers worry that some kids don't get enough of the right foods to help them learn, or in the worst cases, have no lunchbox at all.
These twelve parents and teachers tell Mamamia about their lunchbox shaming stories; what they did and how it made them feel.
1. Nicole, mum.
"My 5-year-old has been told his baked snacks were unhealthy, which was not the case as my snacks are homemade and very healthy. He then started not eating them and asking for them to eat on the way home from school as he was hungry.
"I was very upset to see him hungry and being shamed over food and very disappointed that the staff member at the school was teaching him the wrong thing as the muffin contained very healthy ingredients and very little sugar.
"Not to mention that any issue such as this should involve talking to the parent instead of shaming a five-year-old in front of peers. I was shocked at being judged so harshly, and annoyed that my son was being told the wrong thing. I think there will always be kids with very unhealthy lunches and those who are not fed at all. These are the children and parents who may need support from the school."
Watch: Madeleine West's lunchbox tips for busy parents. Post continues below.
2. Giulia, teacher.
"I’m a teacher and I’ve seen fabulous lunch boxes and ones that are s**t. I ask kids to eat something healthy first if they have it but otherwise, I try not to interfere. When you make a suggestion parents overreact and make sweeping comments (especially on social media).
"Some of the worst lunchboxes I’ve seen were packets of chips, chocolate bar and a soft drink (every day), Maccas every day, and things that kids can’t open. If you’re going to give your child something please make it easy for them to open.